The folks at Erlang Solutions wrote about their
Real-time Experience at FOSDEM 2018.
The article includes summaries of Michał Piotrowski's talk “Scaling messaging systems” and Bartłomiej Górny's “XMPP as the road to innovation”,
as well as links to the video recordings of those talks.

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Marcel Waldvogel wrote
XMPP: Chat with a Future
in which he discusses how XMPP, with special focus on the JSXC webchat client,
allows us to add real-time chat to existing software.

JC Brand has written about what he calls Slack's bait and switch
in which he argues that Slack's reasoning for dropping their XMPP gateway is disingenious and that XMPP can
either support all the features in Slack already or can be extended to do so.

Still on the topic of Slack, Christian Weiske has written Slack's XMPP fails,
in which he documents how he had opened a number of bug reports at Slack, detailing problems with their XMPP
gateway and how they could improve it. None of his bug reports got fixed.

An alternative XMPP Manifesto for Freedom has been released in response,
in which the author claims that "Spam can be mitigated via client-side entirely" and that server-side measures should not be attempted.
To date it has one signatory.